add excalidraw type to whiteboard file

Signed-off-by: grnd-alt <[email protected]>

websocket_server/ApiService.js

@@ -59,7 +59,7 @@ export default class ApiService {
 		console.log(`[${roomID}] Saving room data to server: ${roomData.length} elements, ${Object.keys(files).length} files`)
 
 		const url = `${this.NEXTCLOUD_URL}/index.php/apps/whiteboard/${roomID}`
-		const body = { data: { elements: roomData, files: this.cleanupFiles(roomData, files) } }
+		const body = { data: { type: 'excalidraw', elements: roomData, files: this.cleanupFiles(roomData, files) } }
 		const options = this.fetchOptions('PUT', null, body, roomID, lastEditedUser)
 		return this.fetchData(url, options)
 	}